• Pararealgar - Wikipedia

    en.wikipedia.org/wiki/Pararealgar Pararealgar is an arsenic sulfide mineral with the chemical formula As 4 S 4 also represented as AsS. It forms gradually from realgar under exposure to light. Its name derives from the fact that its elemental composition is identical to realgar, As 4 S 4.
  • Pararealgar: Mineral information, data and localities.

    www.mindat.org/min-3107.html Red realgar alters to yellow/yellow-orange pararealgar on exposure to light.
  • Pararealgar: The mineral pararealgar: information and pictures

    www.minerals.net/mineral/pararealgar.aspx Pararealgar is the alteration product of the mineral Realgar. It forms when Realgar is exposed to light, which causes a physical change in the structure of the mineral and transforms it into a new mineral. Pararealgar is has the same chemical composition and chemical formula as Realgar, but its crystal form differs. Pararealgar is also ...
  • pararealgar - Wiktionary

    en.wiktionary.org/wiki/pararealgar pararealgar (uncountable) A crumbly arsenic sulfide material that forms gradually from realgar under exposure to light. Further reading “Pararealgar” in David Barthelmy, Webmineral Mineralogy Database, 1997–. “pararealgar”, in Mindat.org‎, Hudson Institute of Mineralogy, accessed 29 August 2016.
  • Realgar: The arsenic mineral realgar: information and pictures

    www.minerals.net/mineral/realgar.aspx Pararealgar is unstable and will eventually crumble into a yellow powder if left in the light. The alteration mineral that Realgar transformed into was generally assumed to be Orpiment, but recent scientific analysis has in fact determined the orange alteration product as Pararealgar. Due to the instability of Realgar, specimens should be ...
  • Pararealgar Mineral Specimen For Sale - Dakota Matrix Minerals

    www.dakotamatrix.com/products/13958/pararealgar Pararealgar - Orange to red Pararealgar, an alteration of Realgar which is associated with Pyrite on the backsite. . This and many more mineral specimens are available for sale at Dakota Matrix Minerals.
  • Pararealgar Mineral Data

    webmineral.com/data/Pararealgar.shtml Visit our Advertisers for Pararealgar : Dakota Matrix Minerals Google Search for Pararealgar John Betts Fine Minerals Search for Pararealgar McDougall Minerals Google Search for Pararealgar Rock and Mineral Shows Google Search for Pararealgar Weinrich Minerals, Inc. Google Search for Pararealgar. Ask about Pararealgar here :
  • Realgar - CAMEO

    cameo.mfa.org/wiki/Realgar Realgar is not particularly stable and can undergo a transformation to a polymorph, pararealgar, AsS; it can also deteriorate badly in oil paint films, resulting in rupturing, cracking and chalking, the pigment itself can fade under the action of light. Arsenic disulfide was made synthetically in the 18th century and sold as arsenic orange.
  • Realgar: Mineral information, data and localities.

    www.mindat.org/min-3375.html An old realgar locality on the Balkan Peninsula is found at Allchar, Republic of Macedonia. Alters to pararealgar on exposure to light. Visually similar to sarabauite and other red arsenic-sulphur minerals.
  • Realgar and Orpiment - Arsenic Sulfide Minerals - Geology

    geology.com/minerals/realgar-orpiment.shtml Orpiment is a monoclinic arsenic sulfide with a yellow-orange color and a chemical composition of As 2 S 3. It has a Mohs hardness of 1-1/2 to 2 and is easily ground into a yellow to yellow-orange powder. Like realgar, its earliest widespread use was as a pigment for paints, inks, and dyes, and it was traded over great distances. ...